chore: gdpr scripts

[joanagmaia]

Changes proposed ✍️

What

• Added gdpr script for questdb
  • Soft delete as we will deprecate this database by the end of this month. In addition, the memberId and username will be modified to a random value so that values cannot be identified.
• Added gdpr script for tinybird
  • Use selective deletion for affected records
• Simplify and update gdpr script for postgres
  • Only allow to delete by memberId. Update tables that need deletion.

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.